Add GM with convex polygon clips
BUG=skia:2051 R=reed@google.com Author: bsalomon@google.com Review URL: https://codereview.chromium.org/136563004 git-svn-id: http://skia.googlecode.com/svn/trunk@13262 2bbb7eff-a529-9590-31e7-b0007b416f81
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gm/convexpolyclip.cpp
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194
gm/convexpolyclip.cpp
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/*
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* Copyright 2014 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "gm.h"
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#include "SkBitmap.h"
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#include "SkGradientShader.h"
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#include "SkTLList.h"
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static SkBitmap make_bmp(int w, int h) {
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SkBitmap bmp;
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bmp.allocN32Pixels(w, h, true);
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SkCanvas canvas(bmp);
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SkScalar wScalar = SkIntToScalar(w);
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SkScalar hScalar = SkIntToScalar(h);
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SkPoint pt = { wScalar / 2, hScalar / 2 };
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SkScalar radius = 3 * SkMaxScalar(wScalar, hScalar);
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SkColor colors[] = { SK_ColorDKGRAY, 0xFF222255,
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0xFF331133, 0xFF884422,
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0xFF000022, SK_ColorWHITE,
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0xFFAABBCC};
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SkScalar pos[] = {0,
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SK_Scalar1 / 6,
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2 * SK_Scalar1 / 6,
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3 * SK_Scalar1 / 6,
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4 * SK_Scalar1 / 6,
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5 * SK_Scalar1 / 6,
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SK_Scalar1};
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SkPaint paint;
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paint.setShader(SkGradientShader::CreateRadial(
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pt, radius,
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colors, pos,
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SK_ARRAY_COUNT(colors),
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SkShader::kRepeat_TileMode))->unref();
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SkRect rect = SkRect::MakeWH(wScalar, hScalar);
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SkMatrix mat = SkMatrix::I();
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for (int i = 0; i < 4; ++i) {
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paint.getShader()->setLocalMatrix(mat);
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canvas.drawRect(rect, paint);
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rect.inset(wScalar / 8, hScalar / 8);
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mat.preTranslate(6 * wScalar, 6 * hScalar);
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mat.postScale(SK_Scalar1 / 3, SK_Scalar1 / 3);
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}
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paint.setAntiAlias(true);
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paint.setTextSize(wScalar / 2.2f);
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paint.setShader(0);
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paint.setColor(SK_ColorLTGRAY);
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static const char kTxt[] = "Skia";
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SkPoint texPos = { wScalar / 17, hScalar / 2 + paint.getTextSize() / 2.5f };
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canvas.drawText(kTxt, SK_ARRAY_COUNT(kTxt)-1, texPos.fX, texPos.fY, paint);
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paint.setColor(SK_ColorBLACK);
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paint.setStyle(SkPaint::kStroke_Style);
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paint.setStrokeWidth(SK_Scalar1);
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canvas.drawText(kTxt, SK_ARRAY_COUNT(kTxt)-1, texPos.fX, texPos.fY, paint);
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return bmp;
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}
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namespace skiagm {
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/**
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* This GM tests convex polygon clips.
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*/
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class ConvexPolyClip : public GM {
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public:
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ConvexPolyClip() {
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this->setBGColor(0xFFFFFFFF);
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}
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protected:
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virtual SkString onShortName() SK_OVERRIDE {
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return SkString("convex_poly_clip");
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}
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virtual SkISize onISize() SK_OVERRIDE {
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return make_isize(435, 440);
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}
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virtual void onOnceBeforeDraw() SK_OVERRIDE {
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SkPath tri;
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tri.moveTo(5.f, 5.f);
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tri.lineTo(100.f, 20.f);
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tri.lineTo(15.f, 100.f);
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fPaths.addToTail(tri);
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SkPath hexagon;
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static const SkScalar kRadius = 45.f;
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const SkPoint center = { kRadius, kRadius };
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for (int i = 0; i < 6; ++i) {
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SkScalar angle = 2 * SK_ScalarPI * i / 6;
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SkPoint point;
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point.fY = SkScalarSinCos(angle, &point.fX);
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point.scale(kRadius);
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point = center + point;
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if (0 == i) {
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hexagon.moveTo(point);
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} else {
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hexagon.lineTo(point);
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}
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}
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fPaths.addToTail(hexagon);
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SkMatrix scaleM;
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scaleM.setScale(1.1f, 0.4f, kRadius, kRadius);
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hexagon.transform(scaleM);
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fPaths.addToTail(hexagon);
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SkPath rotRect;
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SkRect rect = SkRect::MakeLTRB(10.f, 12.f, 80.f, 86.f);
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rotRect.addRect(rect);
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SkMatrix rotM;
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rotM.setRotate(23.f, rect.centerX(), rect.centerY());
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rotRect.transform(rotM);
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fPaths.addToTail(rotRect);
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fBmp = make_bmp(100, 100);
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}
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virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
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const SkPath* path;
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SkScalar y = 0;
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static const SkScalar kMargin = 10.f;
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SkPaint bgPaint;
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bgPaint.setAlpha(0x15);
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SkISize size = canvas->getDeviceSize();
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SkRect dstRect = SkRect::MakeWH(SkIntToScalar(size.fWidth),
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SkIntToScalar(size.fHeight));
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canvas->drawBitmapRectToRect(fBmp, NULL, dstRect, &bgPaint);
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for (SkTLList<SkPath>::Iter iter(fPaths, SkTLList<SkPath>::Iter::kHead_IterStart);
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NULL != (path = iter.get());
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iter.next()) {
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SkScalar x = 0;
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for (int aa = 0; aa < 2; ++aa) {
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canvas->save();
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canvas->translate(x, y);
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canvas->clipPath(*path, SkRegion::kIntersect_Op, SkToBool(aa));
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canvas->drawBitmap(fBmp, 0, 0);
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canvas->restore();
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x += fBmp.width() + kMargin;
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}
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for (int aa = 0; aa < 2; ++aa) {
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static const char kTxt[] = "Clip Me!";
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SkPaint txtPaint;
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txtPaint.setTextSize(23.f);
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txtPaint.setAntiAlias(true);
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txtPaint.setColor(SK_ColorDKGRAY);
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SkPaint clipOutlinePaint;
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clipOutlinePaint.setAntiAlias(true);
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clipOutlinePaint.setColor(0x50505050);
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clipOutlinePaint.setStyle(SkPaint::kStroke_Style);
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clipOutlinePaint.setStrokeWidth(0);
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canvas->save();
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canvas->translate(x, y);
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SkPath closedClipPath = *path;
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closedClipPath.close();
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canvas->drawPath(closedClipPath, clipOutlinePaint);
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canvas->clipPath(*path, SkRegion::kIntersect_Op, SkToBool(aa));
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canvas->scale(1.f, 1.8f);
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canvas->drawText(kTxt, SK_ARRAY_COUNT(kTxt)-1,
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0, 1.5f * txtPaint.getTextSize(),
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txtPaint);
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canvas->restore();
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x += fBmp.width() + kMargin;
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}
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y += fBmp.height() + kMargin;
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}
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}
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private:
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SkTLList<SkPath> fPaths;
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SkBitmap fBmp;
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typedef GM INHERITED;
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};
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DEF_GM( return SkNEW(ConvexPolyClip); )
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}
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@ -39,6 +39,7 @@
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'../gm/composeshader.cpp',
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#'../gm/conicpaths.cpp',
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'../gm/convexpaths.cpp',
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'../gm/convexpolyclip.cpp',
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'../gm/convexpolyeffect.cpp',
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'../gm/copyTo4444.cpp',
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'../gm/cubicpaths.cpp',
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